cc: Async readback.

Provide a path to get a readback of a layer's subtree via an
asynchronous mechanism.

This path is used for all the cc pixel tests, to show that it
works. Also by some unit tests:

LayerTreeHostTestAsyncReadback.GLRenderer_RunSingleThread
LayerTreeHostTestAsyncReadback.GLRenderer_RunMultiThread
LayerTreeHostTestAsyncReadback.SoftwareRenderer_RunSingleThread
LayerTreeHostTestAsyncReadback.SoftwareRenderer_RunMultiThread
LayerTreeHostTestAsyncReadbackLayerDestroyed.RunSingleThread
LayerTreeHostTestAsyncReadbackLayerDestroyed.RunMultiThread

BUG=179896

Review URL: https://chromiumcodereview.appspot.com/14060015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@196747 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 5 insertions, 0 deletions

diff --git a/cc/quads/render_pass_unittest.cc b/cc/quads/render_pass_unittest.cc
index f2271b5..9ab0123 100644
--- a/cc/quads/render_pass_unittest.cc
+++ b/cc/quads/render_pass_unittest.cc
@@ -29,6 +29,7 @@ struct RenderPassSize {
   gfx::RectF damage_rect;
   bool has_transparent_background;
   bool has_occlusion_from_outside_target_surface;
+  std::vector<RenderPass::RequestCopyAsBitmapCallback> copy_callbacks;
 };
 
 TEST(RenderPassTest, CopyShouldBeIdenticalExceptIdAndQuads) {
@@ -47,6 +48,7 @@ TEST(RenderPassTest, CopyShouldBeIdenticalExceptIdAndQuads) {
                transform_to_root,
                has_transparent_background,
                has_occlusion_from_outside_target_surface);
+  pass->copy_callbacks.push_back(RenderPass::RequestCopyAsBitmapCallback());
 
   // Stick a quad in the pass, this should not get copied.
   scoped_ptr<SharedQuadState> shared_state = SharedQuadState::Create();
@@ -72,6 +74,9 @@ TEST(RenderPassTest, CopyShouldBeIdenticalExceptIdAndQuads) {
             copy->has_occlusion_from_outside_target_surface);
   EXPECT_EQ(0u, copy->quad_list.size());
 
+  // The copy callback should not be copied/duplicated.
+  EXPECT_EQ(0u, copy->copy_callbacks.size());
+
   EXPECT_EQ(sizeof(RenderPassSize), sizeof(RenderPass));
 }